I have been using them for 10 days now, and I think some of the negative
reviews were of the prototype versions they released. These produce good vapor and do not crack. I had one leak, because I did not put the plug back in after filling. With the plug in, it quit leaking. I have not had one die on me yet. They are not super easy to refill. I still believe my
juice tastes a little better out of the dual
coils, but these are real close.